In article ,
Sjouke Burry wrote:

I have even seen optics and electronics combined in an experimental
Road radar for car control from Philips, radar output was a very small
horn antenna connected to a wave guide, and in front of that they used a
plexyglass condensor lens to make a narrow beam, like you do with light.
Apparently those mm waves liked that plastic lens just fine.

It's also possible to use photonic crystals and quasicrystals to
refract and band-process electromagnetic energy across a very wide
range of frequencies... all the way from radio, through microwave,
through far infrared, and into the optical spectrum.

--
Dave Platt AE6EO
Friends of Jade Warrior home page: http://www.radagast.org/jade-warrior
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